An ISA definition for Kingdom Hearts 2 AI
https://govanify.com/post/kh2ai/
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79 lines
1.6 KiB
79 lines
1.6 KiB
OPCodes are 8 bits, 0x0-0xB, lowest bits. Arguments come BEFORE(!!!!)
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def value():
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if(Y==1): return state_r1+cmd
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if(Y==2): return state_r2+cmd
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if(Y==3): return cmd_0x10+(cmd<<1) #drops the opcode
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else: return cmd
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-0x0, PUSH, 48 bit operand, encoded 0xX000ZZZZZZZZ:
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Y=X>>2
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if(X & 3 == 2): r1 = mem[value(Y)]
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if(X & 3 != 2): r1 = value(Y)
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state_reg3=*addr
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-0x1, 16 bit operand, encoded 0xZYZ1:
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r1 = value(Y)
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r1 = state_reg3...???????
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-0x2, 16 bit operand, encoded 0xZYZ1:
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-0x3, 32 bit operand, encoded 0x3:
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r1 = state_reg3 + *addr
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XX001000
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^
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-0x8, JMP, 32 bit operand, encoded bXX001000:
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state_reg2=X*4
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*(state_reg2)=pc
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entrypoint=X
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-0xA, JMP, 32 bit operand, encoded bXAXXYYYY:
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-0x5:
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--&3==0 aka integer:
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-0: to_int
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-2: minus
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-3: invert
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-4,8: compare w/ zero
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-5: absolute
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-6: ??
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-7: inferior to one
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-9: not equal to zero
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-0xa
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-0xb: is_positive
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--&3==1 aka float:
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-1: convert to word fixed point
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-2: minus
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-5: ABS
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-6: inferior to 0
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-7: inferior or equal to 0
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-8: equal to zero
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-9: not equal to zero
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-0xA: inferior or equal to zero
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-0xB: inferior to zero
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1da3f8
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======
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tmp=reg3
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reg3-=0x4
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t3[left]=tmp-1
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t3[right]=tmp-4
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=============================================================================================================
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TODO:
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0x0: reverse unknowns + fix push label vs val
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0x1: pop, reverse unknowns(get_arg)
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0x2: to reverse(FUN_002fdd68)
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0x4: to reverse(FUN_002fdd68)
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0xB: to reverse
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-----
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0x8: figure out first arg of jmp, offset?
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0x7: figure out args and diff between 3 jmp
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